Subject Information.

1 Subject information. Ages are given as weeks+days. Two different bipolar montages were used. 1 = F4-C4, C4-O2, F3-C3, C3-O1, T4-C4, C4-Cz, Cz-C3, C3-T3, 2 = F4-C4, C4-P4, P4-O2, F3-C3, C3-P3, P3-O1, T4-C4, C4-Cz, Cz-C3, C3-T3. Remaining electrodes indicates those electrodes used for analysis after artefact rejection and removal of short (−14. Ultrasound details are indicated by N = normal, A = intraventricular/parenchymal haemorrhage (grade 4) left hemisphere, intraventricular haemorrhage (grade 3) right hemisphere, B = left germinal matrix haemorrhage, grade 4, C = bilateral germinal matrix haemorrhage grade 1 and cystic changes in post ventricular white matter and D = bilateral intraventricular haemorrhage involving parenchyma on right, grade 3 left, grade 4 right. Further details provide known follow up details for each subject. One child (subject 7) died of non-neurological complications of prematurity.